When you get behind the wheel, you rarely think about how much engineering is hidden under the asphalt or rocks. One of them is tunnel, without which modern roads, especially in megacities and mountainous areas, would be impossible. This is not just a “hole in the ground”, but a complex structure with its own traffic rules, ventilation system, lighting and even emergency exits.
In Russia and the CIS countries, tunnels have been built for more than a century: the first road tunnel in Moscow (Lefortovo) appeared in 1938, and today their total length is hundreds of kilometers. However, many drivers still confuse tunnels with overpasses, overpasses or even bridges. In this article we will look at what a tunnel is from a technical and legal point of view, what types there are, how modern structures are constructed and why driving through a tunnel increases the risk of accidents by 30% compared to an open road (traffic police data for 2023).
What is a tunnel: definition and key features
According to GOST R 52398-2005 and SNiP 32-04-97, tunnel is a closed engineering structure designed for the movement of vehicles, pedestrians or the laying of communications underground, water or in the thickness of rocks. Its main differences from other road objects:
- 🔹 Closed space: the ceiling and walls completely isolate the roadway from the external environment (unlike bridges or overpasses).
- 🔹 Artificial lighting: Even during daytime, lights or LED panels are required.
- 🔹 Limited visibility: Maximum viewing distance is up to 150 meters (versus 300+ meters on the open road).
- 🔹 Special security systems: smoke detectors, emergency exits, fire hydrants.
Legally, a tunnel is considered a section of road with a special traffic regime. This means that additional traffic rules apply here (clauses 19.1–19.2), and fines for violations are higher than on regular highways. For example, speeding in a tunnel is punishable by deprivation of rights for 4–6 months (Article 12.9 of the Administrative Code), while outside the city you can get away with a fine for the same speed.
⚠️ Attention: If there is a sign at the entrance to the tunnel3.24 "Maximum speed limit"with a number60 km/h, this is not a recommendation, but a mandatory requirement. Violations are recorded by cameras in tunnels automatically with an accuracy of up to 1 km/h.
Types of tunnels: classification by design and purpose
Tunnels are divided into groups according to several criteria: construction method, location, materials and even “age”. For example, in Moscow there are tunnels built in the 1930s (brickwork) and modern structures made of cast-in-place concrete with earthquake-resistant joints. Let's look at the main types:
| Tunnel type | Examples | Features |
|---|---|---|
| Mountain | Roki tunnel (North Ossetia), tunnel under the pass Seven (Crimea) | They are laid in rocks and often have a curved trajectory. Require increased ventilation due to the high concentration of exhaust gases. |
| Underwater | Tunnel under the strait Eastern Bosphorus (Vladivostok), English Channel (France-England) | They are constructed using the method of submersible sections or panel penetration. They have sealed sluices and water pumping systems. |
| Urban | Lefortovo tunnel (Moscow), tunnel under Neva (St. Petersburg) | Often multi-lane (up to 6 lanes in one direction), with integrated pedestrian crossings. |
| Railway | Severomuysky Tunnel (BAM), a tunnel under Suramsky pass (Georgia) | They have a smaller height (up to 7 m) and width, but reinforced walls for vibration loads from trains. |
Separately allocate pedestrian tunnels (for example, underground passages in the metro) and combined - when roads, metro and utilities are combined in one structure (as in Nagatinsky tunnel Moscow).
How a modern road tunnel works: engineering systems
If you think that a tunnel is just a “pipe” with asphalt inside, you are mistaken. Modern buildings are equipped with dozens of systems that operate synchronously. For example, in tunnel under the Neva River (St. Petersburg) established:
- 🔦 Lighting: LED panels with automatic brightness control (even during the day they turn on at 70% power).
- 💨 Ventilation: longitudinal or transverse system with CO₂ sensors. In emergency mode, it replaces air in 2–3 minutes.
- 🚨 Fire alarm: heat sensors are triggered at +60°C, and smoke sensors are triggered when smoke is 10% of the norm.
- 📡 Communication: signal amplifiers for mobile operators and radio communications for emergency services.
- 🚧 Emergency exits: located every 150–200 meters, leading to technical galleries or to the surface.
Interesting fact: in tunnel under the Eastern Bosphorus (Vladivostok) installed seismic sensors, which, in the event of an earthquake of magnitude 5+, automatically closes the entrance and turns on emergency lighting. And in Moscow tunnels they use CCTV system with number plate recognition, which records not only the speed, but also unfastened seat belts or talking on the phone.
How do smoke detectors work?
Laser or optical sensors are installed in tunnels that analyze the density of particles in the air. If a threshold is exceeded (for example, 0.5 mg/m³ of soot), the system automatically turns on the fans at maximum power, alerts the dispatcher and can even block traffic if the smoke does not dissipate within 1 minute.
Rules for driving tunnels according to traffic rules 2026: what has changed
In 2026, amendments to Traffic rules (clauses 19.1–19.3), which have tightened the requirements for traffic in tunnels. Now, for some violations, fines have doubled. Basic rules:
- Speed mode: if there are no signs, the maximum speed is
70 km/h(previously it was 80 km/h). Moscow tunnels often impose restrictions60 km/h. - Distance: minimum distance to the vehicle in front -
50 meters(or 3 seconds in time). The violation is recorded by cameras with laser rangefinders. - Headlights: must be enabled
low beam or DRLeven during the day. For driving without lights - a fine500 rubles(Article 12.20 of the Administrative Code). - Stopping and parking: prohibited categoricallyexcept in emergency situations. Fine -
3,000 rubles(in Moscow and St. Petersburg -3,500 rubles). - Overtaking: allowed only if the tunnel has
3+ lanes in one directionand there are no prohibiting signs.
New rule 2026: prohibition on using cruise control in tunnels longer than 1 km. This is due to the fact that the system does not always have time to react to sudden braking of the vehicle in front. Failure to comply with this requirement will result in a warning or fine. 1,000 rubles.
⚠️ Attention: If an accident occurs in the tunnel or the car stalls, you can't leave the salonwithout turning on the hazard warning lights and placing a warning triangle at a distance 30 meters (outside the tunnel - 15 meters). In 2023, 12% of accidents in tunnels were caused by drivers not following this rule.
Are the headlights low beam on?
Is cruise control turned off (if the tunnel is longer than 1 km)
Is a distance of 50+ meters maintained?
Is the phone turned off (talking on the speakerphone is also prohibited)
Are the windows closed (smoke spreads faster in case of fire) -->
Dangers and emergencies: how to act
Tunnels are 5 times more dangerous than open roads: according to EMERCOM of Russia, here fires occur 3 times more often and mass road accidents with a chain reaction occur 7 times more often. Main risks:
- 🔥 Fire: Due to limited space, the temperature rises to +1000°C in 5 minutes. The cause in 60% of cases is faulty electrical wiring or collisions.
- 💥 Collapse: relevant for mountain tunnels. For example, in 2022 tunnel on the M-4 Don highway A section of the ceiling collapsed due to groundwater.
- 🚗 Congestion: during rush hour the speed in Moscow tunnels drops to
10–15 km/h, which provokes the “accordion effect”. - 👁️ Oncoming light blinds: blinding by the headlights of oncoming cars is to blame for 25% of road accidents (data from the traffic police).
Algorithm of actions in case of fire in a tunnel:
- Pull over to the side of the road immediately
turn off the engineandturn on the emergency lights. - Leave the car through left door (if driving on the right) and head to the nearest emergency exit (indicated by arrows on the walls).
- Don't run against traffic - smoke and fire spread faster in the direction of ventilation.
- If smoke makes it difficult to breathe, bend down (the air is cleaner near the floor) and cover your mouth with a damp cloth.
In 2023, an experiment was conducted in Russia: in tunnel on the Moscow Ring Road simulated a fire. It turned out that at a temperature of +800°C concrete walls can withstand the load no more than 40 minutes, and steel structures deform within 15 minutes. Therefore, evacuation must take place as quickly as possible.
If you often drive through tunnels, keep it in the glove compartment. gas mask or respirator with carbon monoxide filter (costs from 1,500 rubles). In the event of a fire, this will give you an additional 5-7 minutes to evacuate.
Fines for violations in tunnels: current amounts in 2026
Violations in tunnels are punished more severely than on regular roads. This is due to the high risk of mass accidents and the difficulty of evacuation. The table shows current fines as of June 2026:
| Violation | Fine (rub.) | Additional punishment |
|---|---|---|
| Exceeding the speed limit by 20–40 km/h | 1 500–2 500 | — |
| Speeding by 40+ km/h | 5 000 | Deprivation of rights for 4–6 months |
| Stop or parking | 3,000 (3,500 in Moscow/St. Petersburg) | Car evacuation |
| Driving without low beams | 500 | — |
| U-turn or reverse | 2 500 | — |
| Using cruise control (in tunnels 1+ km) | 1 000 | — |
Important: if the violation was recorded by a camera, the fine will be sent by mail within 15 days. If stopped by an inspector, the amount can be reduced by 50% if paid within the first 20 days (Article 32.2 of the Administrative Code).
Special case - driving in the oncoming lane in the tunnel. Here the penalty is 5,000 rubles or deprivation of rights for 1 year. In 2023, 1,243 drivers in Russia were deprived of their licenses for this violation (data from the State Traffic Safety Inspectorate).
The biggest fine in the tunnel is 50,000 rubles for travel to red traffic light (if this led to an accident). Under normal conditions, the maximum fine for a traffic light is 1,000 rubles.
Tunnels of the future: innovations and projects in Russia
By 2030, Russia plans to build more than 50 new tunnels, including underwater and mountain ones. Among the most ambitious projects:
- 🚇 Tunnel under the Kerch Strait: an alternative to the bridge, length 18 km, cost - 1.2 trillion rubles. Construction will begin in 2026.
- ⛰️ Tunnel through the Ural Mountains: will shorten the route from Europe to Asia by 700 km. The project is estimated at 800 billion rubles.
- 🏙️ Underground interchange on the Moscow Ring Road (Moscow): 6-level tunnel with bicycle paths, opening in 2027.
- 🔋 "Smart" tunnels with AI: in test mode they work in St. Petersburg. The system predicts traffic jams and accidents 10 minutes before they occur.
Innovations in construction:
- 🤖 Mining robots: replace people during drilling, reducing construction time by 30%. Used in tunnel under the Neva.
- 🌿 Eco tunnels: Walls are covered with moss or vertical gardens to purify the air (pilot project in Sochi).
- ☀️ Solar panels: Photocells are installed on the roofs of the tunnels, which provide up to 20% of the energy for lighting.
In 2026 in tunnel on the M-11 Neva highway tested autonomous driving system. Cars with autopilot (level 3+) can travel through the tunnel at speeds up to 90 km/h, if the mode is enabled "Tunnel Assist". For now, this is only allowed for test zones, but from 2026 the rule could extend to all new tunnels.
FAQ: Frequently asked questions about tunnels
Is it possible to use fog lights instead of low beams in a tunnel?
No. According to clause 19.1 of the traffic rules, in the tunnel necessarily inclusion low beam headlights or daytime running lights (DRL). Fog lights can be used only together with low beam. Penalty for violation - 500 rubles.
What to do if the engine stalls in the tunnel?
Turn it on immediately alarm and try to pull over to the side of the road. If it doesn't work out - do not leave the caruntil you place a warning triangle at a distance 30 meters behind. Call a tow truck using the number indicated on the tunnel walls (usually 112 or special tunnel service number).
Why is overtaking prohibited in some tunnels?
Overtaking in the tunnel is only permitted if:
- Yes
3+ stripesin one direction. - No sign
3.20 "Overtaking is prohibited". - Visibility is
at least 300 meters(in most tunnels it is limited to 150 meters).
In city tunnels, overtaking is almost always prohibited due to high traffic density and the risk of chain accidents.
How to find out if there are cameras in the tunnel recording violations?
In Russia all tunnels longer than 500 meters equipped with automatic recording cameras. They record:
- 🚗 Speeding (accuracy ±1 km/h).
- 📵 Talk on the phone without hands-free.
- 🚫 Unfastened seat belts.
- 🛑 Stopping in the wrong place.
Information about the location of the cameras can be checked on the website traffic police or in applications like "Yandex.Radar".
What happens if there is an earthquake in the tunnel?
In earthquake-prone regions (Crimea, Kamchatka, North Caucasus), the tunnels are equipped with:
- 🔧 Shock-absorbing seams - absorb vibration.
- 🚪 Emergency gateways - sealed doors that protect against collapse.
- 📢 Automatic warning system — broadcasts voice instructions.
In case of an earthquake of magnitude 5+, the tunnel automatically overlaps, the emergency lighting turns on, and the ventilation switches to dust filtering mode.